Shell script

A shell script is a script written for the shell, or command line interpreter, of an operating system. It is often considered a simple domain-specific programming language. Typical operations performed by shell scripts include file manipulation, program execution, and printing text.
Many shell script interpreters double as command line interface.

Shell languages

bash, Bourne again shell, the most widespread shell in the Free Un*x and Linux world,

ksh, Korn shell, essentially a predecessor to bash and a simpler version thereof,